Emergency blankets (also known as space blankets, shock blankets, weather blankets, thermal blankets, safety blankets, first aid blankets, emergency blankets, and Mylar blankets) are thin, heat-reflective blankets. A small layer of plastic is covered with a metallic reflecting substance, which reflects nearly all of the heat radiated. Emergency blankets are commonly used in the military for a variety of functions, including tent preparation, camouflage, and more.
Thermal radiation, water evaporation, and convection all cause heat loss in the body, hence emergency blankets are commonly used to avoid this. They're useful because they don't take up a lot of room and can be simply carried around in a backpack or storage container. As a result, they can save lives if people become stranded and unable to return to civilization for an extended length of time. Because of their lightweight design and thin structure, they operate well in severe situations.
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